大别山桐城地区雷庄低温高压榴辉岩的增温退变P-T轨迹及其构造含义

石永红,林伟,王清晨. 大别山桐城地区雷庄低温高压榴辉岩的增温退变P-T轨迹及其构造含义[J]. 岩石学报, 2008, 24(8).
引用本文: 石永红,林伟,王清晨. 大别山桐城地区雷庄低温高压榴辉岩的增温退变P-T轨迹及其构造含义[J]. 岩石学报, 2008, 24(8).
SHI YongHong,LIN Wei,WANG QingChen. The P-T path with increasing temperature during retrograde metamorphism for the low-temperature and high-pressure eclogites from Leizhuang across Tongcheng area in Dabie Mountains and its tectonic significance[J]. Acta Petrologica Sinica, 2008, 24(8).
Citation: SHI YongHong,LIN Wei,WANG QingChen. The P-T path with increasing temperature during retrograde metamorphism for the low-temperature and high-pressure eclogites from Leizhuang across Tongcheng area in Dabie Mountains and its tectonic significance[J]. Acta Petrologica Sinica, 2008, 24(8).

大别山桐城地区雷庄低温高压榴辉岩的增温退变P-T轨迹及其构造含义

  • 基金项目:

    国家自然科学基金

The P-T path with increasing temperature during retrograde metamorphism for the low-temperature and high-pressure eclogites from Leizhuang across Tongcheng area in Dabie Mountains and its tectonic significance

  • 早期的研究显示大别山东段(安徽部分)出露的榴辉岩均为中温榴辉岩,并没有其他类型榴辉岩存在.本研究通过对桐城地区雷庄附近的榴辉岩野外地质调查、岩相学、矿物成分化学以及热力学分析表明,该地区榴辉岩为低温高压榴辉岩.榴辉岩的P-T演化特征研究区分了5个变质阶段,展示了一个"发卡式"增温退变轨迹.Ⅰ-阶段的变质温压为T=390~411℃,P=0.89~1.40GPa;Ⅱ-阶段为T=527~544℃,P=1.95~2.34GPa.该阶段为峰期变质,代表了板片俯冲最大深度;Ⅲ-阶段为T=501~519℃,P=1.74~2.14GPa;Ⅳ-阶段为T=630和P=1.22GPa;Ⅴ-阶段为T=350℃,P=0.20GPa.由Ⅲ-阶段至Ⅳ-阶段随着压力的降低,温度明显增加,反映了一个退变增温的演化趋势.这种增温可能是由于低温榴辉岩对温度变化的敏感,以及榴辉岩板片在折返至地壳某一深度停滞时间较长,北大别热穹隆和地温梯度的恢复是导致增温的热源.
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